Predict the order of the following reactions in terms of...

Predict the order of the following reactions in terms of increasing $\Delta \mathrm{S}$ : (a) $\mathrm{NH}_3(\mathrm{~g})+\mathrm{HCl}(\mathrm{g}) \longrightarrow \mathrm{NH}_4 \mathrm{Cl}(\mathrm{g})$ (b) $\mathrm{H}_2 \mathrm{O}(\mathrm{g}) \longrightarrow \mathrm{H}_2 \mathrm{O}(l)$ (c) $2 \mathrm{O}_3(\mathrm{~g}) \longrightarrow 3 \mathrm{O}_2(\mathrm{~g})$ (d) $\mathrm{H}_2(\mathrm{~g})+\mathrm{F}_2(\mathrm{~g}) \longrightarrow 2 \mathrm{HF}(\mathrm{g})$

Predict the order of the following reactions in terms of increasing $\Delta \mathrm{S}$ :
(a) $\mathrm{NH}_3(\mathrm{~g})+\mathrm{HCl}(\mathrm{g}) \longrightarrow \mathrm{NH}_4 \mathrm{Cl}(\mathrm{g})$
(b) $\mathrm{H}_2 \mathrm{O}(\mathrm{g}) \longrightarrow \mathrm{H}_2 \mathrm{O}(l)$
(c) $2 \mathrm{O}_3(\mathrm{~g}) \longrightarrow 3 \mathrm{O}_2(\mathrm{~g})$
(d) $\mathrm{H}_2(\mathrm{~g})+\mathrm{F}_2(\mathrm{~g}) \longrightarrow 2 \mathrm{HF}(\mathrm{g})$

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Phase Changes

Different phases have intrinsic entropy levels, with gases possessing high entropy due to their greater molecular freedom, liquids having moderate entropy, and solids exhibiting low entropy. Phase transitions, such as condensation or crystallization, usually involve significant entropy changes.

Entropy

Entropy is a measure of the disorder or randomness in a system. In chemical reactions, the change in entropy (?S) evaluates how the disorder of the reacting system increases or decreases as reactants convert to products.

Reaction Stoichiometry and Change in Moles of Gas

In many reactions, especially those involving gases, the change in the number of gas moles is critical. A decrease in the number of gas molecules typically leads to a decrease in entropy, whereas an increase results in higher entropy. This concept helps in predicting the overall entropy change based on the reaction's balanced equation.

Transcript

Please give Ace some feedback